Fibonacci is read about 1,755 times a day, in 118 languages.
A typical day, 30 days to 15 October 2026
The middle day of the days counted, so one week of news cannot move it. The line under it is the last 390 days, one point a day.
Something wrong?He brought the digits 0 through 9 to Europe. Before Fibonacci's 1202 textbook, Western merchants and scholars were still wrestling with Roman numerals - a system that made even basic arithmetic a slog.
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About this person
Leonardo Bonacci was born around 1170 in the Republic of Pisa, son of a customs official. In 1202 he published Liber Abaci, a book that introduced the Indo-Arabic numeral system to the Western world and demonstrated how merchants could calculate faster than they ever had with Roman numerals. The same text included an example problem about rabbit populations that produced what we now call the Fibonacci sequence, though he didn't name it after himself. The nickname "Fibonacci" - short for filius Bonacci, "son of Bonacci" - didn't appear in print until 1838, though a notary had called him "Lionardo Fibonacci" as early as 1506. He died sometime between 1240 and 1250, widely regarded as the most talented mathematician the medieval West had produced.
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